MESON Chess Problem Database

Problem Display
PID: 179906 (B6B/p1PP1Pr1/2KR4/1PR1N3/1p1Nk1P1/5pP1/1rP2P2/Qn5b w - - 0 1)

Gross, Erwin

Comm., Schweizerische Arbeiter Schachzeitung, 1974

B6B/p1PP1Pr1/2KR4/1PR1N3/1p1Nk1P1/5pP1/1rP2P2/Qn5b

#2

16 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Qe1#
    • 1...Sa3
      • 2.Qe1#
    • 1...a5
      • 2.Kb6#
    • 1...a6
      • 2.Kb6#
  • Tries
    • 1.Sb3?
      • threat
        • 2.Rd4#
      • 1...Rg6
        • 2.Rc4#
      • 1...Rxg4!
    • 1.Sf5?
      • threat
        • 2.Rd4#
      • 1...Rg6
        • 2.Rc4#
      • 1...Rxg4!
    • 1.Re6?
      • threat
        • 2.Sexf3#
      • 1...Kxd4
        • 2.Rc4#
      • 1...Rxc2
        • 2.Kd6#
      • 1...Rg6
        • 2.Sxg6#
      • 1...Rg5!
    • 1.Qxb1?
      • threat
        • 2.Qe1#
      • 1...Rxc2
        • 2.Qxc2#
      • 1...Rb3
        • 2.cxb3#
      • 1...Rxb1!
    • 1.f8Q?
      • threat
        • 2.Qf4#
        • 2.Qf5#
      • 1...Rxg4
        • 2.Qf5#
      • 1...Rg5
        • 2.Qf4#
      • 1...Rf7!
  • Keys
    • 1.Rc4!
      • threat
        • 2.Sdxf3#
      • 1...Kxe5
        • 2.Re6#
      • 1...Rxc2
        • 2.Sxc2#
      • 1...Rxg4
        • 2.Kc5#
      • 1...Sd2
        • 2.Qe1#
      • 1...Sa3
        • 2.Qe1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(a);OGATE::QAR(A)
    • P(g);::B(O)+K(J)
  • Tries
    • Try
      • S(E);
      • Threat
        • R1(K)
      • Vars
        • R(h);P_PINR(K)::R(H)
      • Refutation
        • R(h);XP(F)
    • Try
      • S(E);
      • Threat
        • R1(K)
      • Vars
        • R(h);P_PINR(K)::R(H)
      • Refutation
        • R(h);XP(F)
    • Try
      • R(K);
      • Threat
        • R(K)+S(I),XP(d)
      • Vars
        • K(f);OGATEB,P-FLIGHT,P_SPINR(c),XS(E)::R1(H)
        • R(c);P_PINR(H),XP(B)::B(O)+K(J)
        • R(h);P_PINR(K)::R(K)+S(I),XR(h)
      • Refutation
        • R(h);
    • Try
      • Q(A);XS(a)
      • Threat
        • QAR(A)
      • Vars
        • R(c);OGATE,P_PINR(H),P_SPINR(c),XP(B)::QAB(A),XR(c)
        • R(c);OGATE::QAB(A)+P(B),XR(c)
      • Refutation
        • R(c);XQ(A)
    • Try
      • P(N);
      • Threat
        • DUALS(2)
      • Vars
        • R(h);XP(F)::QAB1(N)
        • R(h);::QAR1(N)
      • Refutation
        • R(h);
  • Actual
    • R(H);
    • Threat
      • R(H)+S(E),XP(d)
    • Vars
      • K(f);OGATEB,P-FLIGHT,P_SPINR(h),XS(I)::R1(K)
      • R(c);P_PINR(H),XP(B)::R(H)+S(E),XR(c)
      • R(h);XP(F)::B(O)+K(J)
      • S(a);OGATE::QAR(A)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).